﻿/*
 * Copyright (c) 2015-2016 Constantijn Evenhuis (blueprints@const.nl)
 * 
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 * 
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */
using System;
using System.Collections;
using System.Collections.Generic;

namespace Blueprints.IO
{
    internal sealed partial class NodeInfoReader : IBlueprintReader
    {
        private readonly BlueprintReader_NodeCounter counter = new BlueprintReader_NodeCounter();

        public NodeInfoReader(IBlueprintReader underlyingReader)
        {
            UnderlyingReader = underlyingReader;
        }

        public IBlueprintReader UnderlyingReader
        {
            get;
            private set;
        }

        INode IEnumerator<INode>.Current
        {
            get
            {
                return Current.Node;
            }
        }

        public NodeInfo Current
        {
            get
            {
                INode underlyingNode = UnderlyingReader.Current;
                if (underlyingNode == null)
                {
                    return default(NodeInfo);
                }

                return new NodeInfo(underlyingNode, DocumentUri, Path);
            }
        }

        object IEnumerator.Current
        {
            get
            {
                return Current;
            }
        }

        public Uri DocumentUri
        {
            get
            {
                return UnderlyingReader.DocumentUri;
            }
        }

        public string Path
        {
            get
            {
                return counter.Path;
            }
        }

        public bool MoveNext()
        {
            if (!UnderlyingReader.MoveNext())
            {
                return false;
            }

            switch (Current.Node.NodeType)
            {
                case NodeType.StartNode:
                    counter.Push(Current.Node.Name);
                    break;
                case NodeType.EndNode:
                    if (counter.Depth == 0)
                    {
                        return false;
                    }

                    counter.Pop();
                    break;
            }

            return true;
        }

        void IEnumerator.Reset()
        {
            UnderlyingReader.Reset();
        }

        void IDisposable.Dispose()
        {
        }
    }
}